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Demons (鬼 in the original Japanese) are supernatural cannibalistic monsters who are the main antagonist species of the manga Demon Slayer. They were originally humans who are cursed by Muzan Kibutsuji, turned into ravenous monsters feeding on human flesh, and most of them have no shred of humanity inside of them. When they perish they are disintegrated into nothingness without leaving any trace.
The demons are remorseless cannibals who only care is to eat humans to gain strength. They enjoy causing destruction and agonies. They are loyal to their creator, Muzan Kibutsuji but deeply fear him since their lives are totally at his whim. Even if with a family of humans, they pretended to care for them for their safeties such as Muzan with his wife and daughter.
Demons are most dangerous when they are just converted; when humans are freshly turned into Demons they are utterly consumed by their gnawing hunger so they lose all reasoning, causing them to attack and devour any humans - be they stranger or even loved ones - within close vicinity.
However, there are few demons who have humanity inside of them such as Nezuko Kamado, Tamayo and Yushiro. By struck of luck they managed to escape from Muzan's deadly control of their lives. They despise Muzan for their own reasons (being manipulated into conversion in case of Tamayo, Muzan attempting on his lady's life in case of Yushiro and forcibly in case of Nezuko) and join hands with Demon Slayer Corps to take out the Demon lord. These renegade Demons stopped eating humans and instead discovered other means to sustain themselves (Nezuko substituted her hunger for human flesh with sleep, Yushiro and Tamayo drink donated bloods with minimal amounts). They are willing to protect those who they cares such as Nezuko defending her brother Tanjiro and Yushiro defending Tamayo.
While vast majority of Demons are humanoids, there is one exception: Tamayo's Demon pet named Chachamaru is a cat and is also free from Muzan's control.
Although they must feed on human flesh and blood to sustain themselves whether they wish or not, thereby inevitably becoming enemies of humanity, they were once humans whom many have traumatic pasts. Although there are wicked former humans such as Muzan, Douma, Hantengu, Kaigaku and Gyokko whose villainies can only be stopped with their deaths, most of them suffered extreme injustices and harshness beyond their control in their human lives which enabled Muzan to manipulate wounds in their hearts to becoming Demons or they were so shattered both mentally and physically to the point that they saw no way out other than becoming Demons. Some of humans turned into humans did not have choice at all and end up devouring those who they once cherished most.
Also because Demons became what they are by Muzan's blood that can act as internal surveillance device injected in them, their lives are completely under Muzan's mercy. And even if Demons achieve justices they could not get in their human lives, even if they redeem themselves, because of sins they committed as Demons (especially eating humans, which is deemed a mortal sin in the world of Demon Slayer), their souls are condemned to hell for eternity no matter how virtuous or moral they once might have been as humans.
Because Muzan created these Demons, all crimes Demons commit against humanity are linked both directly and indirectly to Muzan.
Powers and Abilities
- Nigh Immortality: Demons possess eternal youth. They are immune to normal weapons. The only way to kill them is either its own kind, the sun or through decapitation by Nichirin Blades.
- Regeneration: Demons are able to regenerate their body but unable to regenerate when they are killed by the sunlight sword or the light from the sun.
- Physical Abilities: Demons possess powers far exceed ordinary humans after eaten humans or other demons for powers and strength.
- Evolution: the more humans Demons consume the stronger they become, although the degree of potential varies upon individuals. But as the series progresses, some Demons show evolution by total immunity to beheading (Muzan), resistant to sunlight (Kamado siblings), can survive decapitation for a while (Akaza and Kokushibou) etc.
- Blood Demon Arts: Demons possessed a magical arts by using their bloods.
After Muzan Kibutsuji's death, the demons who were in his control became extinct except few Demons who are fortunate enough to escape from his control; those few still live. Fast forwarding to the Reiwa Era (2019 AD ~ ongoing) of Japan, the Demons' existence are now dismissed by modern day people as merely fairy tale creatures and imaginary monsters.
However, a botanist named Aoba Hashibira, a descendant of Inosuke Hashibira, discovered the Blue Spider Lilies, mystical flowers that Muzan had been desperately searching for in his quest for true immortality for a millennium. It is revealed that the Blue Spider Lily is a flower that only blooms during 2-3 days (at random) out of an entire year, meaning Muzan and Demons who cannot walk under the sun could never have it.